feat: add PaymentTransaction table for gateway-level tracking

- New PaymentTransaction entity (Domain/Entities/Payment/) with all gateway fields:
  GatewayProvider, MerchantId, Authority, CardPan, CardHash, RefId, VerificationStatusCode, etc.
- New PaymentTransactionConfiguration with indexes on Authority, GatewayProvider, UserId, TransactionId, RefId
- Added DbSet<PaymentTransaction> to IApplicationDbContext and ApplicationDbContext
- Extended PaymentVerificationResult DTO with CardPan, CardHash, VerificationCode
- Updated ZarinPalPaymentService.VerifyPayment to return CardPan/CardHash/VerificationCode
- Updated all 5 payment consumers to create/update PaymentTransaction:
  * PlaceOrderCommandHandler — creates PaymentTransaction after InitiatePayment
  * PaymentCallbackController — updates PaymentTransaction after VerifyPayment
  * ChargeDiscountWalletCommandHandler — creates PaymentTransaction + fixed callback URL
  * VerifyDiscountWalletChargeCommandHandler — updates PaymentTransaction after verify
  * TransactionsService.CustomerPaymentRequest/Verification — create/update PaymentTransaction
  * PackageService.CustomerPurchasePackage/Verify — create/update PaymentTransaction
- Transaction table untouched — PaymentTransaction is a separate table
- Pattern inspired by PYMS: create row before gateway → update after verify
- EF migration: AddPaymentTransactionTable

src/CMSMicroservice.Application/WalletCQ/Commands/VerifyDiscountWalletCharge/VerifyDiscountWalletChargeCommandHandler.cs

@@ -56,6 +56,19 @@ public class VerifyDiscountWalletChargeCommandHandler
                 "OK"  // وقتی این handler فراخوانی میشه یعنی کاربر از درگاه برگشته — Status باید OK باشه
             );
 
+            // آپدیت PaymentTransaction با نتیجه verify
+            var paymentTx = await _context.PaymentTransactions
+                .FirstOrDefaultAsync(pt => pt.Authority == request.Authority, cancellationToken);
+            if (paymentTx != null)
+            {
+                paymentTx.PaymentStatus = verifyResult.IsSuccess;
+                paymentTx.VerificationStatusCode = verifyResult.VerificationCode;
+                paymentTx.VerificationStatusMessage = verifyResult.Message;
+                paymentTx.CardPan = verifyResult.CardPan;
+                paymentTx.CardHash = verifyResult.CardHash;
+                paymentTx.RefId = verifyResult.TrackingCode;
+            }
+
             if (!verifyResult.IsSuccess)
             {
                 _logger.LogWarning(
@@ -101,6 +114,13 @@ public class VerifyDiscountWalletChargeCommandHandler
             _context.Transactions.Add(transaction);
             await _context.SaveChangesAsync(cancellationToken);
 
+            // لینک PaymentTransaction به Transaction داخلی
+            if (paymentTx != null)
+            {
+                paymentTx.TransactionId = transaction.Id;
+                await _context.SaveChangesAsync(cancellationToken);
+            }
+
             _logger.LogInformation(
                 "Discount wallet charged successfully. UserId: {UserId}, TransactionId: {TransactionId}, RefId: {RefId}",
                 user.Id,